28 Questions
What is the primary aim of determining the bleeding time of a patient?
To assess the body's ability for complete stopping of blood flow
What is being evaluated through the bleeding time test?
Platelet function and the body's ability for complete stopping of blood flow
What is not a purpose of determining the bleeding time of a patient?
To determine the patient's blood glucose level
What is an indirect assessment of through the bleeding time test?
The body's ability for complete stopping of blood flow
Why is the bleeding time test important?
It determines the patient's risk of bleeding complications
What is the conversion rate of spots to minutes in Ivy's method?
2 spots = 1 minute
What is the initial pressure raised to in the BP apparatus during Ivy's method?
40 mm Hg
What part of the body is the cuff of the BP apparatus applied to during Ivy's method?
Upper arm
What is the purpose of raising the pressure in the BP apparatus during Ivy's method?
To induce bleeding
What is the final step in Ivy's method after applying the cuff and raising the pressure?
Record the bleeding time
What is the first step in the bleeding time test?
Puncture the lower part of the earlobe (or fingertip) using a lancet
How often should the blood be wiped with a filter paper during the bleeding time test?
Every 30 seconds
What is the indication to stop the stopwatch during the bleeding time test?
When the blood fails to appear on the filter paper
What is the purpose of puncturing the lower part of the earlobe or fingertip?
To create a wound to measure bleeding time
What is the final step in the bleeding time test?
Record the result and calculate the bleeding time
What is the normal bleeding time by the method described?
Up to 9 minutes
What is usually found when the platelet count is below 50,000/μL?
Prolonged bleeding time
What is the clotting time?
The time interval from oozing of blood after a cut or injury till formation of clot
What is the main purpose of the clotting time test?
To determine the clotting time of a subject
What is the material used in the clotting time test?
Fine capillary glass tubes of about 10 mm length
What is the method of pricking the finger in the capillary tube method?
Using a lancet
What is the purpose of starting the stop watch in the capillary tube method?
To measure the clotting time
What is observed after one minute of starting the stop watch in the capillary tube method?
Breaking small pieces of the capillary tube every 30 seconds
What is a condition where bleeding time is normal, but clotting time is prolonged?
Hemophilia
Which of the following conditions can lead to prolonged clotting time?
Vitamin K deficiency and Liver disease
What is a possible cause of prolonged clotting time in a patient?
Vitamin K deficiency
A patient is on anticoagulant therapy. What can be expected?
Prolonged clotting time
Which of the following is NOT a cause of prolonged clotting time?
Bleeding disorder
Study Notes
Bleeding Time Test
- Aim: to determine bleeding time to assess platelet function and body's ability to stop blood flow
- Steps:
- Prick the lower part of the earlobe (or fingertip) with a lancet, making a 3-4 mm deep incision
- Start the stopwatch and wipe the blood every 30 seconds with a filter paper without squeezing
- Stop the stopwatch when blood fails to appear on the filter paper
- Count the spots of blood on the filter paper (each 2 spots = 1 minute)
- Record the result and calculate the bleeding time
Ivy's Method
- Applied to the upper arm, with pressure raised to 40 mm Hg
- Normal bleeding time: up to 9 minutes
- Used on the front of the forearm
Prolonged Bleeding Time
- Found when:
- Platelet count is below 50,000/μL
- There is platelet dysfunction
Clotting Time
- Definition: time interval from oozing of blood after a cut or injury to formation of clot
- Normal clotting time: 2-8 minutes
- Aim: to determine the clotting time of a subject
Clotting Time Test
- Materials:
- Fine capillary glass tubes (about 10 mm length)
- Lancet
- Stop watch
- Cotton and 70% alcohol
- Two methods:
- Glass Container Method (Lee and White Method)
- Capillary Tube Method
Capillary Tube Method
- Steps:
- Clean the finger with 70% alcohol and allow to dry
- Prick the finger by lancet
- Draw blood up in the capillary glass tube
- Start the stop watch
- Break small pieces of the capillary tube every 30 seconds until a fibrin thread is seen between the two broken ends
Conditions of Prolonged Clotting Time
- Found in:
- Hemophilia (bleeding time is normal)
- Vitamin K deficiency
- Liver disease
- Anticoagulant therapy
A medical test to assess platelet function and the body's ability to stop blood flow, involving a lancet incision and measuring bleeding time.
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